projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* rwsem.S: RW semaphore assembler. |
| 2 | * | |
| 3 | * Written by David S. Miller (davem@redhat.com), 2001. | |
| 4 | * Derived from asm-i386/rwsem.h | |
| 5 | */ | |
| 6 | ||
| 7 | #include <asm/rwsem-const.h> | |
| 8 | ||
| c6d64c16 | 9 | .section .sched.text, "ax" |
| 1da177e4 LT |
10 | |
| 11 | .globl __down_read | |
| 12 | __down_read: | |
| 13 | 1: lduw [%o0], %g1 | |
| 14 | add %g1, 1, %g7 | |
| 15 | cas [%o0], %g1, %g7 | |
| 16 | cmp %g1, %g7 | |
| 17 | bne,pn %icc, 1b | |
| 18 | add %g7, 1, %g7 | |
| 19 | cmp %g7, 0 | |
| b445e26c | 20 | membar #StoreLoad | #StoreStore |
| 1da177e4 | 21 | bl,pn %icc, 3f |
| b445e26c | 22 | nop |
| 1da177e4 LT |
23 | 2: |
| 24 | retl | |
| 25 | nop | |
| 26 | 3: | |
| 27 | save %sp, -192, %sp | |
| 28 | call rwsem_down_read_failed | |
| 29 | mov %i0, %o0 | |
| 30 | ret | |
| 31 | restore | |
| 32 | .size __down_read, .-__down_read | |
| 33 | ||
| 34 | .globl __down_read_trylock | |
| 35 | __down_read_trylock: | |
| 36 | 1: lduw [%o0], %g1 | |
| 37 | add %g1, 1, %g7 | |
| 38 | cmp %g7, 0 | |
| 39 | bl,pn %icc, 2f | |
| 40 | mov 0, %o1 | |
| 41 | cas [%o0], %g1, %g7 | |
| 42 | cmp %g1, %g7 | |
| 43 | bne,pn %icc, 1b | |
| 44 | mov 1, %o1 | |
| 45 | membar #StoreLoad | #StoreStore | |
| 46 | 2: retl | |
| 47 | mov %o1, %o0 | |
| 48 | .size __down_read_trylock, .-__down_read_trylock | |
| 49 | ||
| 50 | .globl __down_write | |
| 51 | __down_write: | |
| 52 | sethi %hi(RWSEM_ACTIVE_WRITE_BIAS), %g1 | |
| 53 | or %g1, %lo(RWSEM_ACTIVE_WRITE_BIAS), %g1 | |
| 54 | 1: | |
| 55 | lduw [%o0], %g3 | |
| 56 | add %g3, %g1, %g7 | |
| 57 | cas [%o0], %g3, %g7 | |
| 58 | cmp %g3, %g7 | |
| 59 | bne,pn %icc, 1b | |
| 60 | cmp %g7, 0 | |
| b445e26c | 61 | membar #StoreLoad | #StoreStore |
| 1da177e4 | 62 | bne,pn %icc, 3f |
| b445e26c | 63 | nop |
| 1da177e4 LT |
64 | 2: retl |
| 65 | nop | |
| 66 | 3: | |
| 67 | save %sp, -192, %sp | |
| 68 | call rwsem_down_write_failed | |
| 69 | mov %i0, %o0 | |
| 70 | ret | |
| 71 | restore | |
| 72 | .size __down_write, .-__down_write | |
| 73 | ||
| 74 | .globl __down_write_trylock | |
| 75 | __down_write_trylock: | |
| 76 | sethi %hi(RWSEM_ACTIVE_WRITE_BIAS), %g1 | |
| 77 | or %g1, %lo(RWSEM_ACTIVE_WRITE_BIAS), %g1 | |
| 78 | 1: | |
| 79 | lduw [%o0], %g3 | |
| 80 | cmp %g3, 0 | |
| 81 | bne,pn %icc, 2f | |
| 82 | mov 0, %o1 | |
| 83 | add %g3, %g1, %g7 | |
| 84 | cas [%o0], %g3, %g7 | |
| 85 | cmp %g3, %g7 | |
| 86 | bne,pn %icc, 1b | |
| 87 | mov 1, %o1 | |
| 88 | membar #StoreLoad | #StoreStore | |
| 89 | 2: retl | |
| 90 | mov %o1, %o0 | |
| 91 | .size __down_write_trylock, .-__down_write_trylock | |
| 92 | ||
| 93 | .globl __up_read | |
| 94 | __up_read: | |
| 95 | 1: | |
| 96 | lduw [%o0], %g1 | |
| 97 | sub %g1, 1, %g7 | |
| 98 | cas [%o0], %g1, %g7 | |
| 99 | cmp %g1, %g7 | |
| 100 | bne,pn %icc, 1b | |
| 101 | cmp %g7, 0 | |
| b445e26c | 102 | membar #StoreLoad | #StoreStore |
| 1da177e4 | 103 | bl,pn %icc, 3f |
| b445e26c | 104 | nop |
| 1da177e4 LT |
105 | 2: retl |
| 106 | nop | |
| 107 | 3: sethi %hi(RWSEM_ACTIVE_MASK), %g1 | |
| 108 | sub %g7, 1, %g7 | |
| 109 | or %g1, %lo(RWSEM_ACTIVE_MASK), %g1 | |
| 110 | andcc %g7, %g1, %g0 | |
| 111 | bne,pn %icc, 2b | |
| 112 | nop | |
| 113 | save %sp, -192, %sp | |
| 114 | call rwsem_wake | |
| 115 | mov %i0, %o0 | |
| 116 | ret | |
| 117 | restore | |
| 118 | .size __up_read, .-__up_read | |
| 119 | ||
| 120 | .globl __up_write | |
| 121 | __up_write: | |
| 122 | sethi %hi(RWSEM_ACTIVE_WRITE_BIAS), %g1 | |
| 123 | or %g1, %lo(RWSEM_ACTIVE_WRITE_BIAS), %g1 | |
| 124 | 1: | |
| 125 | lduw [%o0], %g3 | |
| 126 | sub %g3, %g1, %g7 | |
| 127 | cas [%o0], %g3, %g7 | |
| 128 | cmp %g3, %g7 | |
| 129 | bne,pn %icc, 1b | |
| 130 | sub %g7, %g1, %g7 | |
| 131 | cmp %g7, 0 | |
| b445e26c | 132 | membar #StoreLoad | #StoreStore |
| 1da177e4 | 133 | bl,pn %icc, 3f |
| b445e26c | 134 | nop |
| 1da177e4 LT |
135 | 2: |
| 136 | retl | |
| 137 | nop | |
| 138 | 3: | |
| 139 | save %sp, -192, %sp | |
| 140 | call rwsem_wake | |
| 141 | mov %i0, %o0 | |
| 142 | ret | |
| 143 | restore | |
| 144 | .size __up_write, .-__up_write | |
| 145 | ||
| 146 | .globl __downgrade_write | |
| 147 | __downgrade_write: | |
| 148 | sethi %hi(RWSEM_WAITING_BIAS), %g1 | |
| 149 | or %g1, %lo(RWSEM_WAITING_BIAS), %g1 | |
| 150 | 1: | |
| 151 | lduw [%o0], %g3 | |
| 152 | sub %g3, %g1, %g7 | |
| 153 | cas [%o0], %g3, %g7 | |
| 154 | cmp %g3, %g7 | |
| 155 | bne,pn %icc, 1b | |
| 156 | sub %g7, %g1, %g7 | |
| 157 | cmp %g7, 0 | |
| b445e26c | 158 | membar #StoreLoad | #StoreStore |
| 1da177e4 | 159 | bl,pn %icc, 3f |
| b445e26c | 160 | nop |
| 1da177e4 LT |
161 | 2: |
| 162 | retl | |
| 163 | nop | |
| 164 | 3: | |
| 165 | save %sp, -192, %sp | |
| 166 | call rwsem_downgrade_wake | |
| 167 | mov %i0, %o0 | |
| 168 | ret | |
| 169 | restore | |
| 170 | .size __downgrade_write, .-__downgrade_write |